Got the car used and new the radio didnt work, but got the radio code from dealer and the am/fm/tape now work but when I press CD, I just get "CD error". Its Model No MC 3196NA, CD Wechsler, 002 820 5989. The date stamp on the changer which is trunk mounted is 1998, so I assume the original changer had already failed. The good news is that while its my 1st Benz, I', a Certified electronics tech and even though car radios is not my thing, I was unable to find and obvious issue. Bad news is with the maybe original radio in there and the car being so old, the best bet may be to just live with the am/fm/cass as sad as it sounds. If I could find a junkyard and do a simple plug it in nad see if it works in 5 seconds that would be great but used changer all seem to high even used. I've heard the 6 CD changers had problems and I'm likely looking at more problems if I get a used one. Ant hint as to what the "CD error" might mean other than the player has just failed? Thanks.